Milan Technology MIL-SM801XX manual Incorrect connections, Diagnosing LED Indicators, Cabling

7. Troubleshooting

This section is intended to help you resolve the most common problems on the MIL- SM801XX series.

Incorrect connections

nFaulty or loose cables

Look for loose or obviously faulty connections. Make sure the connections are snug. If that does not correct the problem, try a different cable.

nNon-standard cables

Non-standard or incorrectly pinned cables may cause anything from network collisions to no network connectivity at all. A category 5 cable tester is recommended during your network installation.

nImproper Network Topologies

It is important to make sure that you have a valid network topology. Common topology faults include excessive cable length and too many repeaters (hubs) between end nodes. In addition, you should make sure that your network topology contains no data path loops. Between any two-end nodes, there should be only one active cabling path at any time. Data path loops will cause broadcast storms that will severely impact your network performance.

Diagnosing LED Indicators

You can diagnose common problems by monitoring the LED indicators on the front panel of the switch. If you are having network connection issues the first place to check is the switches LED link lights. If you do not have a link light, you may have an incorrect cable type.

If the power LED does not light up when the power cord is plugged in, you may have a problem with power outlet, or power cord.

nCabling

RJ-45 ports - Use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable for the RJ-45 connections. Use 100ohms Category 3, 4 or 5 cable for 10Mbps connections or 100ohms Category 5 cable for 100Mbps connections. Also be sure that the length of any twisted-pair connection does not exceed 100 meters (328 feet).

100Base-FX fiber port - Fiber multi-mode connector type must use 50/125 or 62.5/125µ multi-mode fiber cable. You can connect two devices up to 2-kilometers. With single-mode fiber use 9/125µ fiber cable for multi-mode as well. You can connect two devices from 15 to ~60- kilometers in full duplex operation.

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